package com.sky.handler;

import com.sky.constant.MessageConstant;
import com.sky.exception.BaseException;
import com.sky.result.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.sql.SQLIntegrityConstraintViolationException;

/**
 * 全局异常处理器，处理项目中抛出的业务异常
 */
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {

    /**
     * 捕获业务异常
     *
     * @param ex
     * @return
     */
    @ExceptionHandler
    public Result exceptionHandler(BaseException ex) {
        log.error("异常信息：{}", ex.getMessage());
        return Result.error(ex.getMessage());
    }

    /**
     * 处理SQL异常
     *
     * @param ex
     * @return
     */
    @ExceptionHandler(SQLIntegrityConstraintViolationException.class)
    public Result exceptionHandler(SQLIntegrityConstraintViolationException ex) {
        // Duplicate entry 'zhangsan' for key 'idx_username'
        log.error("异常信息：{}", ex.getMessage());
        String message = ex.getMessage();
        if (message.contains("Duplicate entry")) {
            String[] split = message.split(" ");
            String username = split[2];
            String msg = username + MessageConstant.ALREADY_EXISTS;
            return Result.error(msg);
        } else {
            return Result.error(MessageConstant.UNKNOWN_ERROR);
        }
    }

    /**
     * 处理参数校验异常
     * @param ex
     * @return
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public Result handleValidationExceptions(MethodArgumentNotValidException ex) {
        /**
         * getBindingResult()
         * 获取绑定结果（包含所有校验错误）
         * getAllErrors()
         * 获取所有错误信息列表
         * .get(0)
         * 取第一个错误
         * getDefaultMessage()
         * 获取该错误的提示信息
         */
        String defaultMessage = ex.getBindingResult().getAllErrors().get(0).getDefaultMessage();
        return Result.error(defaultMessage);
    }


}
